Re: [PATCH] memory hotplug: fix invalid memory access caused bystale kswapd pointer

[David Rientjes]

On Thu, 14 Jun 2012, Jiang Liu wrote:

> Function kswapd_stop() will be called to destroy the kswapd work thread
> when all memory of a NUMA node has been offlined. But kswapd_stop() only
> terminates the work thread without resetting NODE_DATA(nid)->kswapd to NULL.
> The stale pointer will prevent kswapd_run() from creating a new work thread
> when adding memory to the memory-less NUMA node again. Eventually the stale
> pointer may cause invalid memory access.
> 
> Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
> Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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